To factor 121x
2
- y
4
,
use the form a
2
- b
2
= (a - b)(a + b),
where here "a" is "11x" and "b" is "y
2
", to get
:
121x
2
- y
4
= (11x - y
2
)(11x + y
2
).
No more factoring is possible.
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